//
//  main.m
//  libdispatch
//
//  Created by Hechun on 2020/11/8.
//

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        // insert code here...
        NSLog(@"Hello, World!");
        
        static dispatch_once_t onceToken;
        dispatch_once(&onceToken, ^{
            
        });
        
        dispatch_once_gate_s;
    }
    return 0;
}
